Peltier element, TEC1 12726, For cooler bag, Current generator, 15.4 V, 240 W

This is a board that contains many PN junctions. When the Peltier element is powered, one side heats up and the other side cools down. Which side will be heated and which will be cooled depends on which of its two ends is fed plus and which minus. In short, when the polarity is reversed, the cooling side is exchanged with the heating side. In order not to overheat this part that is being heated, it is necessary to have a radiator on it to cool it. The temperature of the cold side depends on how well the heated side is cooled. It is possible to achieve a temperature of -15℃ on the cold side while cooling the hot side to 3-6℃. It is widely used in cooler bags, water dispensers (water cooling machines) and other devices. The Peltier element also has the opposite effect. It can also be used as a voltage generator. This is achieved by applying to it the action that it does itself, and more precisely by cooling one side of it, and at the same time heating the other. A potential difference (electric current) is created at the output of the element. The magnitude of the resulting voltage depends on a number of factors, such as the temperature difference, how many watts the element is, etc.